Syringe



April 12, 1932. F. A. CROSSETT SYRINGE Filed Sept. 9. 1929 INVENTOR fieiefiz Patented Apr. 12, 1932 i i UNITED STATES PATENT OFFICE FREDERICK A. CROSSETT, OF LOS ANGELES, CALIFORNIA, ASSIGNOB- TO MARY v.A.

DITTBENNER, OF CHICAGQILLINOIS SYRINGE Application filed September 9, 1929. Serial No. 391,330.

My invention relates to syringes of thatof fluid. The syringe here illustrated comcharacter adapted for use in the application prlses two tubes and 16, the latter .tube of medicaments interiorly of the body, and having a sliding fit within the former in it is a purpose of my invention to provide order that the two may be adjusted longi- 5 a syringe which is operable to induce from tudinally to increase or decrease the fluid caembodying my invention, and will then point of a short length of tubing 18 formed of hard from.

a Source of supply a predetermined quanpacity of the tube 15, as .will be more fully tity of fluid medicament and to expel such described hereinafter. The tube 15 constifluid therefrom for injection into thebody. tutes a barrel into which the fluid being It is also a purpose of my invention to handled is adapted to be induced. This tube not only provide a syringe in which the fluid 1s preferably formed of an inflexible and taken in is of a known quantity, but to protransparent material such as glass, its transvide a syringe which. is adjustable to permit parency permitting one to observe the presthe quantity induced therein to be varied, ence or absence of fluid in the barrel, and and in consequence of which, the amount exwhether or. not the syringehas been proppelled is likewise varied to the end of inerly operated to induce that quantity of fluid jecting into the body fluid medicament of for which the syringe has been adjusted. any desired quantity within the limits of the The tube 16 is preferably constructed of a a it f th ring flexlble rubber, and its upper end commu- I will describe only one form of syringe nicates with a bulb 17 through the medium out the novel features thereof in claims. rubber having a uniform external diameter. In the accompanying drawings: As previously described. the tube 16 is fitted Fig. 1 is a viewshowing in side elevation for sliding movement within the barrel 15 yet one form of syringe embodying my invenit is essential that a fluid tight seal be protion extended into a receptacle containing a vided between the tube and barrel in order medicament (the receptacle being shown in that the bulb 17 may operate to induce and section), and the parts of the syringe in poexpel fluid'into and from the barrel. I efsition for inducing fluid into the syringe. fect such .a fluid tight seal by forming on the Fig. 2 is a view similar to Fig. 1 but showupper end of the barrel 15 and interiorly 39 ing the syringe in'vertical section and filled thereof an annular bead 19 which operates with medicament from the receptacle. to slightly compress the tube 16 and yet not Fig. 3 is a viewshowing the syringe in interfere with adjustment of the tube inthe side elevation and partly in section and in. barrel. This head 19 is preferably formed the act of expelling the medicament thereby subjecting the upper end of the glass barrel to a fusing heat which causes constriction Fig; 4 is a view similar to Fig. 3 illustratof the barrel end to produce the bead. The ing one adjustment of the svringe by which inner or lower end of the tube 16 provides the .quantity'of fluid induced therein may be a port 20 that establishes communication bevaried. tween the tube and the barrel, and as best Fig. 5 is an enlarged transverse sectional illustrated in Fig. 2 the inner end of the tube view taken on the line 55 of Fig. 3. 16 is of frusto-conical form to provide a ta- In carrying out my invention. I provide pered seat 21 surrounding the port 20. a syringe particularly designed. although not Movable within the barrel 15 is a valve V necessarily. for the application of a fluid having a cylindrical portion 22- of such dimedicament to the parts of the body, and ameter as to have a loose fit within the barrel consequently the syringe is of the hand opthat air may escape therearound, and so that erated type. although it will be understood the valve will operate as intended even in the that the principles involved in my syringe presence of liquid on the inner wall of the may be embodied in a mechanically ope'rated barrel. The valve V also includes a conical syringe for the handling of larger-quantities portion23.which in the closed position of the valve is'adapted to extend into and close the port 20. It is important to note that the conical portion 23 is reversely disposed in respect to the conical seat 21 and in consequence of which, when the valve is in'closed position its conical portion snugly fits within the seat I and tends to expand the latter, thus assuring a fluid tight closure of the port- 20. The cylindrical portion of the valve V operates as a plunger or piston to aid in expelling liquid from the barrel, but to prevent such portion breaking the lower end of the glass arrel by impingement thereagainst, T interpose a ring 24 preferably formed of soft rubber, and which, as shown in Fig. 2 is disposed within the barrel adjacent its lower is, when the bulb 17 is not compressed. To

fill the syringe with a medicament or any other fluid, the ported end of the barrel is submerged into the *fluid as illustrated in Fig. 1, and the bulb 17 compressed. Such compression of. the bulb expels air from the barrel to produce apartial vacuum therein, and in so doing, the valve is unseated and projected downwardly against the ring 24. With release of the bulb, fluid is drawn into the barrel 15 through the port 25, and concurrently with this. filling action, the valve .V is drawn upwardly to close the port 20. Thus, that part of the barrel beneath the valve is filled with liquid, as illustrated in Fig. 2. To expel the llquid, it is only necessary to again compress the bulb when the valve is unseated, thus allowing the air pressureto act against the valve to eject the liquid from the barrel through the port 25 as illustrated-in Fig. 3. Once the fluid is expelled from the barrel, the bulb returns to expanded position to again elevate the valve against the seat 21. Expansion of the bulb isfacilitated by-forming therein a small vent opening' 26.

As previously described herein, the tube 16 is adjustable longitudinally within the barrel 15, and for the purpose of increasing or decreasing the fluid capacity of the barrel 15 in order that the syringe may be operated to induce therein predetermined'and variable quantities of liquid. Medicamentsare .dispensed in predetermined quantities known as doses. and depending upon the nature and progress of the ailment such doses are decreased and increased as to quantity. In"

my syringe I obtain such variation as follows: a

Should it be desired to increase the quantity of fluid induced into the barrel, the tube 16' is moved outwardly of the barrel, thus increasing the fluid capacity of the barrel for it will be understood that when inducing liquid into the barrel closing of the valve V checks such induction, and consequently by increasing the distance between the ring 24 on the port 20, that part of the barrel between the port 20 and the port 25 is permitted to fill before the valve closes the port 20. Conversely, if it is desired to. decrease the quantity of liquid induced into the barrel, the tube 16 is moved inwardly of the barrel and the reverse action takes place in respect to the closure of the valve. Thus, the syringe is adjustable to vary the quantity of liquid induced therein, and it will be understood that by careful adjustment of the tube 16 a predetermined quantity of fluid may be induced therein to correspond to a particular dose.

I claim:

1. A syringe, comprising tubes telescopically associated with each other to permit adjustment longitudinally one upon the other, a valve movable in the outer tube,

means at the outer end of the outer tube for the inner tube for producing, when compressed, pressure in the outer tube to project the valve to the outer end of the outer tube and thus expel any fluid in the outer tube, and when expanded toproduce a suction in the outer tube for drawing fluid therein and for moving the valve to close said ort.

2. A syringe, comprising a barrel a plunger valve movable in the barrel, one end of the barrel having a reduced opening to confine the plunger valve against ejection from said end, a bulb connected to the other end of the barrel, and a port in the barrel between the bulb and plunger valve positioned to be closed by the plunger valve, said valve having a conical portion and the port a conical seat reversely disposed with respect to the ,-conical valve portion.

3. A syringe as embodied in claim 1 wherein the inner end of the inner tube end is of conical form, while the valve has a conical portion reversely disposed with respect to the conical tube end and the latter is of a diameter to partly receive the valve therein.

4. A syringe as embodied in claim 1 wherein the inner tube is formed of rubber and the outer tube of non-yieldable material, the

inner end of the outer tube having an internal bead embracing the inner tube to provide a fluid tight joint between the two.

5. A syringe, comprising a glass tube, a a

rubber tube movable in the glass tube, a bulb on the outer end of the rubber tube, a bead on the inner end of the glass tube contacting with the rubber tube to produce a fluid tight seal between the two, the outer end of the glass tube being constricted to form an outlet port of reduced diameter, the inner end of the rubber tube being of conical form to provide a correspondingly shaped seat, a valve loosely fitted in the glass tube and having a.

conical portion adapted to be extended into the inner end of the rubber tube, said conical portion being reversely disposed with respect 4 to the conical seat, and a ring shaped member in the glass tube adjacent the outlet port providinian abutment for the valve.

6. syringe, comprising 'tube's telescopically associated with each other to permit adjustment longitudinally one upon the other, a valve movable in the outer tube, means at the outer end of the outer tube for confining the valveagainst displacement from the tube,

' a port on the inner end of the inner tube, and

means on the outer tube for providing fluid pressure in the outer tube to project the valve to the outer end of the outer tube and for producing suction in the outer tube to move the valve inwardly to close said port.

- FREDERICK A. CROSSETT.

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